This error path is missing the unlock.

[mchehab@redhat.com: Merged two equal patches into one]
Signed-off-by: NSasha Levin <sasha.levin@oracle.com>
Acked-by: NDavid Härdeman <david@hardeman.nu>
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>